ext/wavpack/gstwavpackenc.*: Use bitrate property solely for bitrates and add new...

ext/wavpack/gstwavpackenc.*: Use bitrate property solely for bitrates and add new bits-per-sample property for the ot...

Original commit message from CVS:
Patch by: Sebastian Dröge  <slomo at circular-chaos org>
* ext/wavpack/gstwavpackenc.c: (gst_wavpack_enc_base_init),
(gst_wavpack_enc_class_init), (gst_wavpack_enc_set_wp_config),
(gst_wavpack_enc_chain), (gst_wavpack_enc_sink_event),
(gst_wavpack_enc_set_property), (gst_wavpack_enc_get_property):
* ext/wavpack/gstwavpackenc.h:
Use bitrate property solely for bitrates and add new
bits-per-sample property for the other stuff. Set duration
to 'unknown' in initial header and resend header with proper
duration on EOS; update Sebastian's e-mail address.